单项选择题

A．Businessmen, managers and accountants.
B．Chemists, physicists and biologists.
C．Governors, doctors and teachers.
D．Engineers, public servants and news reporters.
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单项选择题
A．They begin paying federal taxes from that day.B．It is the last day for people to pay the city tax.C．It is the deadline for paying federal taxes.D．The state tax is due on that day.
A．They begin paying federal taxes from that day.
B．It is the last day for people to pay the city tax.
C．It is the deadline for paying federal taxes.
D．The state tax is due on that day.
单项选择题
Practical application of this principle resulted in ______.
A．new electronic instruments for planes
B．new radio sets for RAF bombers
C．an electronic detecting device
D．a radio directing and ranging device
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